A mix of two separate gems, Lapis Lazuli and Phosphophyllite, who were shattered on the battlefield at some point and used in the gem experiments. Initially unable to form after the forced fusion of their gems, it took the two of them a little over seven hundred years to find a harmony and form in their current appearance.
Because the majority of their gems remain intact, the two of them retain a separated sense of self that often interferes with their stability and can cause them to deform. Most of their differences revolve around their views of Homeworld.
Prior to their shattering and unfortunate fusion, Lapis Lazuli had defected to the side of the Crystal Gems. Phosphophyllite was a Homeworld Gem that came to Earth and aided in the war on the side of Homeworld.